Spinning ring for ring spinning and ring twisting frames

ABSTRACT

A spinning ring for spinning of roving into yarn is provided with a generally T-shaped cross-section with the upper flange of the T having a convex contour at the outer periphery of the ring and a concave or straight contour of the flange top inside the convex portion.

United States Patent Kunz [54] SPINNING RING FOR RING SPINNING AND RING TWISTING FRAMES [72] Inventor: Ernst Kunz, Breitigasse 26,

Oberuster, Switzerland [22] Filed: Oct. 6, 1970 [21] Appl. No.: 78,526

[30] Foreign Application Priority Data Oct. 7, 1969 Switzerland ..l5037/69 [52] US. Cl ..57/1l9 [51] Int. Cl. ..D01h 7/52 [58] Field of Search ..57/l 19 125 [56] References Cited UNlTED STATES PATENTS 1,392,067 9/1921 Lanning "57/119 1451 Oct. 17, 1972 2,748,559 6/1956 1 Carter ..57/119 3,323,300 6/1967 Chilpan ..57/1 19 3,354,628 11/1967 Chilpan ..57/119 Primary Examiner.l0hn Petrakes Attorney-Browdy and Neimark 5 7 ABSTRACT A spinning ring for spinning of roving into yarn is provided with a generally T-shaped cross-section with the upper flange of the '1 having a convex contour at the outer periphery of the ring and a concave or straight contour of the flange top inside the convex portion.

9 Claims, 4 Drawing Figures P'A'TENTED B 11 m2 3.698 176 SHEET 2 OF 2 FIGA I NVEN TOR SPINNING RING FOR RING SPINNING AND RING TWISTING FRAMES The present invention concerns a spinning ring for ring-spinning and ring-twisting frames, with flange and cross-piece, for use during spinning of a roving into yarn.

In spinning and twisting, the traveller rotates on the spinning ring, and in the process the thread is pulled through the traveller in known manner. Now, when the thread tension slackens, the traveller may tilt in the direction of movement and so come to lie on the spinning ring. In so doing, the traveller presses the thread against the spinning ring, with the result that the thread is torn at that point. Such a case arises in particular at starting and stopping, i.e. basically whenever the thread tension suddenly changes.

An object of the present invention is to provide a system avoiding that drawback. It is characterized in that the outer, convex contour of the flange top is connected to a concave or straight contour of the said flange top on the inside of the convex contour by a regular circular truncated cone jacket or an inflexion point circle.

Several embodiments of the invention are not to be illustrated by way of example with reference to the accompanying drawings, in which FIG. I shows part of a spinning ring in cross-section, with the traveller in the normal working position;

FIG. 2 shows partof a spinning ring similar to that in FIG. 1, but with the traveller tilted;

FIGS. 3 and 4 each show part of other forms of spinning rings in cross-section.

The spinning ring 1 (FIGS. 1, 2) presents a generally T-shaped cross-section with a top 4 and a crosspiece 5. Top 4 includes a flange 3. The contour 7 of the flange top 4 comprises an outer contour 9 and an inner contour 11. The two contours 9 and 11, viewed in crosssection, are interconnected by a straight line 13, in particular by an inflexion point tangent. FIG. 1 shows a traveller 15 in upright position, i.e. in the case of normal thread tension in normal spinning or twisting operation. FIG. 2, on the other hand, shows the traveller 15 in diagram in a case when the thread tension changes, in particular when it slackens and the traveller l5, responding to the forces acting on it, comes to lie on the outer contour 9 of the flange top 4. FIGS. 1 and 2 further show a thread 21 in section and a thread 23; the first-mentioned is associated with the traveller 15 in its normal position, while the second is associated with the traveller 15 in the forward-tilted position.

The special upper flange contour 7 ensures that even if the traveller is tilted (FIG. 2) there will still be sufficient clearance between traveller and flange top 4 to prevent any clamping and consequent tearing of the thread 23. In extensive tests with such spinning rings and travellers, it proved possible largely to eliminate the fluffs. Also, there were far fewer thread breakages (up to one-third fewer) than in known systems, despite the fact that very high traveller speeds were attained (over 1,400 rpm).

The curvature radii of the convex and concave, or outer and inner, contours 9 and 11 may be made equal, for instance, preferably 1 mm.

FIG. 3 shows a spinning ring 25 in cross-section, with a flange 27 and a crosspiece 28. Reference 29 indicates the top of the flange 27. Its outer contour 31 and its inner contour 32, viewed in cross-section, are interconnected by a straight line 34. This, in conjunction with the cross-sectional line of the inner contour 32, defines an obtuse re-entrant angle 36 facing away from the ring. The line 34, which is a jacket line of a circular truncated cone jacket 35 whose cone apex is on the spinning ring axis, forms, in conjunction with the straight line 38 parallel to the spinning ring axis, an angle 40 which is between and 70, preferably between 50 and 60.

FIG. 4 shows part of another spinning ring 45. The flange 47 presents a top 49 and is supported by a crosspiece 48. The flange top presents an outer contour 51 and an inner contour 52. The two contours 51 and 52 are interconnected by a dip 53. The transition from the dip 53 to the outer contour 51, viewed in cross-section, is formed by a point of inflexion 55 with the tangent 54. There, the line 34 (FIG. 3) is condensed into the point 55 and, in space, accordingly, the truncated cone 25 jacket of the line 34 becomes an. inflexion point circle 56. As in FIG. 3, the angle 40, of between 30 and is defined between tangent 54 and the line 38 parallel to the axis.

When the value of the angle 40 falls below approximately 30, the traveller cannot, or can hardly, come to lie on the spinning ring.

The ratio of dimensions (b a) indicated in FIGS. 3 and 4 is 0.15 to 0.3, preferably 0.20 to 0.25, more particularly 0.23. It will be understood that dimension a is the width of the flange top, and the dimension b is the distance between the highest points of the outer and inner contour line with horizontal tangents.

It will be obvious to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is shown in the drawings and described in the specification.

What is claimed is:

1. In a spinning ring for ring-spinning and ring-twisting frames using a wire traveller comprising a ring having a generally T-shaped cross-section consisting of a top and a cross-piece, said top having an inner flange and an outer flange, the improvement of reducing the tendency of thread breakage due to the tilting of the traveller and the catching of the thread between the traveller and the ring during periods of slackened thread tension wherein:

said outer flange of said top of said T-shaped ring has a generally convex contour along the outer periphery thereof;

said top has a straight or concave contour connected to said convex contour on the inside thereof by a regular circular truncated cone jacket or an inflexion point circle; and

wherein the cross-sectional angle between said straight contour or the line tangent to the inflexion point between said concave and convex contours and the verticle is between 30 and 70.

2. A spinning ring in accordance with claim I wherein the highest point of said outer flange is high than the highest point of said inner flange.

3. A spinning ring in accordance with claim 1 wherein the ratio of the distance between the highest points of said inner and outer flanges to the total width of said top is between 0.15 and 0.3, inclusive.

4. A spinning ring in accordance with claim 3 wherein said ratio is between 0.20 and 0.25, inclusive.

5. A spinning ring in accordance with claim 1 wherein the contour connected to said convex contour on said top is straight and is connected by said regular circular truncated cone jacket.

6. A spinning ring in accordance with claim 1 wherein the contour connected to said convex contour on said top is concave and is connected by said inflexion point circle.

7. A spinning ring in accordance with claim 6, wherein the curvature radii of said convex and concave portions have the approximate proportion of 1:1.

8. A spinning ring in accordance with claim 1, wherein the section of said top presents at least one reentrant angle.

9. A spinning ring in accordance with claim 1 wherein said angle is between 50 and 60. 

1. In a spinning ring for ring-spinning and ring-twisting frames using a wire traveller comprising a ring having a generally Tshaped cross-section consisting of a top and a cross-piece, said top having an inner flange and an outer flange, the improvement of reducing the tendency of thread breakage due to the tilting of the traveller and the catching of the thread between the traveller and the ring during periods of slackened thread tension wherein: said outer flange of said top of said T-shaped ring has a generally convex contour along the outer periphery thereof; said top has a straight or concave contour connected to said convex contour on the inside thereof by a regular circular truncated cone jacket or an inflexion point circle; and wherein the cross-sectional angle between said straight contour or the line tangent to the inflexion point between said concave and convex contours and the verticle is between 30 and 70* .
 2. A spinning ring in accordance with claim 1 wherein the highest point of said outer flange is higher than the highest point of said inner flange.
 3. A spinning ring in accordance with claim 1 wherein the ratio of the distance between the highest points of said inner and outer flanges to the total width of said top is between 0.15 and 0.3, inclusive.
 4. A spinning ring in accordance with claim 3 wherein said ratio is between 0.20 and 0.25, inclusive.
 5. A spinning ring in accordance with claim 1 wherein the contour connected to said convex contour on said top is straight and is connected by said regular circular truncated cone jacket.
 6. A spinning ring in accordance with claim 1 wherein the contour connected to said convex contour on said top is concave and is connected by said inflexion point circle.
 7. A spinning ring in accordance with claim 6, wherein the curvature radii of said convex and concave Portions have the approximate proportion of 1:1.
 8. A spinning ring in accordance with claim 1, wherein the section of said top presents at least one re-entrant angle.
 9. A spinning ring in accordance with claim 1 wherein said angle is between 50 and 60* . 